FIELD: metering high temperature in metal melts. SUBSTANCE: protective cover is made in the shape of multilayer structure by forming the oxide coating on tubular casing manufactured of zirconium or its alloys. Thermal treatment for forming the oxide coating includes heating of tubular casing in medium with oxygen residual partial pressure Po, isothermal exposure at higher partial pressure of oxygen, and cooling with simultaneous reduction of pressure to value Po. EFFECT: higher efficiency.
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